At the moment, mmhmm cannot recognize app windows that it cannot "see".
You cannot create a screen share slide for app windows that are minimized.
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mmhmm for Mac
App windows that appear minimized in your dock will not be available to screen share in mmhmm until they are restored.
mmhmm for Windows
App windows that are minimized will still appear in the screen share window:
mmhmm will allow you to select it as an option for a screen share slide, however, it will appear as unavailable in the slide deck until the app window is restored.
Virtual backgrounds in your video conferencing app
Zoom, Google Meet, and several other video conferencing platforms offer the ability to apply virtual backgrounds to your webcam. This will prevent your audience from being able to see your mmhmm slides.
To resolve this issue, please make sure you turn off the virtual backgrounds feature in your video conferencing app: